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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fecc4a7a81d8d37781417327fc5463d6a8889703572b32e3ace1d440fc63f644' 
  AND token = 'ze1Mvjhrd6+mpA1llsNRUfQgO8XWKoVAUjjMx6MhzfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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