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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc671c1092a705c6daf146b92e921270cab9e077fefe2c20c0711bce8a3ae06' 
  AND token = 'cShCPpYw3ErNj1tyqDTPCSY8ijdUCpbpnpTD2ky1SX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}