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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a99c7c75cc00f00ee02a8d5a0c1299986cd14149602a23d20e8075b5b25a28' 
  AND token = '0WM1sg8ymAf0ttYl2vO0nbxxqnqv/2Dhd21ngg9OTb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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