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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54573f44a208e30adbedbdda6b505755b83140c5bffa9540519ac17fb92930e4' 
  AND token = 'vdBgN0HykkD9RT6rbZ+NIGJXBZ6G2UyWgvqMzmH+LZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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