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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d8fce8691cbf5a17bb2e8011528adac7cab45c50d682f6929ec350c501ee77' 
  AND token = 'Apo5jog2muF/m3kpjMh2GKX0XdB10//Lm4DdN16u3Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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