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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ef04f7516e5da5c42c13def15fac71eddf4ec93ccb840e6b9756c81fec76e29' 
  AND token = 'HhRXQWpEF/EgpgEXxTqa87QF5NTd3+nD4DB+FyxRupM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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