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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f27bb155eef2a542d22b22ed50f7e51224c22ef2e048b585af2a36f1f38ce6' 
  AND token = 'XBEhmW5flHyZKgkHyL0tRFd90ndIXkVD2DF44iYlM/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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