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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d9c47b137941798297f047899db58e37fc94ef63baac673d4e35c32c6c7aa6' 
  AND token = 'mpLM2SjGIW94+IrblV1EO/86FLU05MPzjoibkUVrMCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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