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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ee489aa36cddbb2316f90816834fb728cd3d055fd8eb248500d9f33002acf8' 
  AND token = 'eww1xLXCo4Yg1rhab9WAz8GIUudXONeLlfKP6nq5/8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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