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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c04075007088b01936a3e8c544fc4669c3cb8a986546906f244b018e1046717' 
  AND token = '+C7W6n9syubuClBEfUSbGlWeGvK8lqvMveMKDcQdlJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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