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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d819bc7bd310e68163b7f2618e77d49c0e7cdfc615a7bdd69278c31cf20ed2f' 
  AND token = '606fo20NVU53AH6q/C01ZsJSud7U1Ro1s5BXMA+n9ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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