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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0908eabd947f00b7e71636bb47b4c97dfda6ea742e5441da32c2b4eb6cac5e0' 
  AND token = 'yrKRPEafl1weye7zoc62yUkhVPKGa3NaprKNxMsK+SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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