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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c1a545a797406a430d80ada6f63e58839684eb7dec18f35fe8dca0c03352ea' 
  AND token = 'aaeIEiovHY1k40+AGiKNdLWbAEm7yrr1wfIz4/e7wa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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