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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c0d0ebc354cac01cf1d2c9e1c2a5eb94780e2961ef68c44986c7aa3a672c7a3' 
  AND token = 'IJPIm5Xnc8ruc2aLrMnVt7KoxgzP+8uUlFJRRQAnyMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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