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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67bcdbd8dc7fa13a7c96d8847c3be8410c5b69540fe0cfa58a030d7b9867a14' 
  AND token = 'Ff0JkLn+HRTXF4OMNcTQ760pi9ADTWj32v7oIRC7qO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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