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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e67526bd98af6ed904d9badb8b363ea08bc981fc97a53372eb5423b4e8dd3f' 
  AND token = 'V8PrCVVKFQxZikVOVWTXiFnfSAVoJQD4kXhbPJ+713g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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