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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832089e2441ee8547fad33f395bcf08ed8ee2c4f56b0f3b44356a2524456e63a' 
  AND token = '2TMDRF93NKexmioh5DAL1WRb3pWA4lu2Ax6EmHWz8kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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