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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c2a9bda646ee75f024cfd3c509d9ff2f8e591d9b21765838c6d752a2ed35eb1' 
  AND token = 'rlAKdY8aBNiyR1yzF38ylK6nkjXvf61+L4sEhJ3Zjb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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