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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bdf49ebde36779123d660e6f5ce4118d45630fd24c656c57476fae9a0afced1' 
  AND token = 'lBgrI/fhtzF9BEejPxgbOAygz1zoy5p0PvWXL+pDLes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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