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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ef07ffab4f7882c6e461c1b46d8e847619a75fe17ed111d7d8c2c30faf71008' 
  AND token = '34MXP9fg+b662PDjCwRkPkybz5dpD7mvMFegtEbPjEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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