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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73c60bff281082d904ef5ad2bc9116926aa9820dcc062b75866a94b408dca98' 
  AND token = 'O5MmmY1r34jJPUm4s3cHUnjkafQHWWBDEV9WFLEkWMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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