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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6fcd3f7b9b555fe5d7e64053345962ec084b94972b9910f4222ad9a92153326' 
  AND token = 'PWb9albOAqrG1oAig1GrpJ2NaciUtgtMVGdPSLABVNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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