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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb9192dd500253fcc206fe01a606aea166431c5624fea7214e0e9ab35873aa5' 
  AND token = 'ieU9AjsBp4ICCk0UIOsnbgFsgb6MLk1Bn0o5/vM6460=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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