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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84998995e575bb1055f112fdda5ad2e921e711ea971847384d21ab5a2fda9c91' 
  AND token = 'MFEvuX90GuJ/7U+b8/ziiSyLyyAvvpUqYohnNZpN8+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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