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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7dcaf4c4fc630ad4ad454d594c753509507cafaa6cabda12d410e38139a0615' 
  AND token = 'CTTXhw0Yj29J0EFgCa+Tbe4DYpdYsA7LMbRkYtg2Vy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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