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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a10e6a309cb0689f7dceefa9e00cae86df60f8cc1265346769e18e89c76d4c' 
  AND token = 'WSMz6BeDHxCY9k0CW7Jn1CUanhk8jTctUpWYYphw754=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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