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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '179c56b6db4697ccfd5f833bc2e22a55e81bf87e36ceacc935cbcd6bf14669a3' 
  AND token = 'Passk3zPUYVzuV7HL1MFgYP65xA8K+tW36KmqEKjcxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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