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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db91fa283d80972c160d7ef00b1e2feaf52a69bfdc98f2fb8ea50af333bf6207' 
  AND token = 'SYdRlDt87vhWhJPHmguctv4YyP3/Tbdv3HpoFW/VBq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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