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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8fa31d8cd372d30c433030f4e1d9661fa1c03c40bb5d8f51c6a3c7dcc986b88' 
  AND token = 'VlvTdnDDlM0d0iq24z0tmtpghPOWhnIFin6Z6HEFnec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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