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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '492558338e3fb876dc90345b684cb35e7002756e78ea590501b62ffc2603ca54' 
  AND token = '4B9kh6dfEd7ckE8NykpREkCQZKAkP323zeh0GgAVjTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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