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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d2b59e4bb2f04025f1e9c9e49fdd82472788d253d7d6d2fe20442db863db81' 
  AND token = 'A92fYe4JNtp6d/1yYFDgylaqqPTSswr+/HcYryava20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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