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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa89f41c39a8ec960dc18abfc8c93b5514948aa6358cfb4abca7a068136e4674' 
  AND token = 'iFlV1WFeDbZz9lISKROVFDpBvsf3DrvmSOQfEl1856I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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