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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa36d8eff3ccc47ea2c269b222aeeb294f8ae3b03db0edb85ac2de98162de4e' 
  AND token = 'RBYmeFlB64OdtkF5I0a6IJqO0CXVGvOhljs5Vrv6ia0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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