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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdfaeed844f0023f866310130fd1690f76c93642b7fc418aeefc07ef8673c113' 
  AND token = 'M3EacJLznQVY7mO29pW/T24aG0sqojm/1xrSgscuRdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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