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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb175d51ac67df8061d94ac09fe827bff4fd2f76672e6a8279876463c1746ec8' 
  AND token = 'N3+MvJhJV7c1/l4kJ+SP/yRxPsJ7jyDc9KjNKjTrRS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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