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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f97d7d621d1c713efc06e63387c4ab0199786631a6c7bb056b50e84d16a0ca' 
  AND token = 'uPssXe/VWHkkYk376QZpv9q552ejqRpJlfl1xI71WY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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