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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4614a461d3cb06e336e51e13f7c8aa4aa8d873c35e2b5087fe07d1d23f7ce4c' 
  AND token = 'J/qOC2FFgDno3u7Aa0v94qGJcMykLUAZHMBNfaUn+8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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