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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ad8c839d7c0c0ef3ea4446d633a8ee15d1ca9b8de0e3e62cc95a71209d3df31' 
  AND token = 'fL9vGpDwxeJaQ4QkCiBhoq5TWJF2mhVmD/lcXFyfQRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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