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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10bff84b8636b58e2c70e4f7f58fc1d2dff9237beddbc44aeda09a5d5545d6b9' 
  AND token = '4bCL8znsayVz9vuuCdPSJAQeIJKBe88krYJni00pAWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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