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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bf077acd07fc1e0f4d4d53898509638f12b7c5fb3d3e421d941b0ef05cc3318' 
  AND token = 'r5PLys2yovRxxFCD3MC8SKYxEPzt7/V6VDsD9TP1h4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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