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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af774d9bc442cc87577ce37b316e1e9951aa852b05fe6e5853d5be21d03ebb88' 
  AND token = 'mJIZ+gxF9ilLXoDO4fTaaAky/kMoFnApT4cok0mfVuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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