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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ce6c749223831527b63f81c8370e6a933a023915062e641010845c43399739' 
  AND token = 'B92nYU6bXt0XVUCk88/22LMzt7JLA9pXmpZWA+PYfKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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