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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f218c3e39dde1249232214368e9ba4093668aee50cbd900c837d036c4f445e76' 
  AND token = 'yLoRUIOTONFObNm0ENNEAZp7aHob5lGWi8HCglgWc+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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