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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da619d4a352f8031980d4ed955a8aaac1145aafa33a51c9cba7be0d217b99445' 
  AND token = 'oa7dFuPWBFOfZb3Vs6E3ZVYneCHiz1zIKaffIGjp0Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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