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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c3b336095514b21e18872e9936dde2d291aa8e926c15d403688893bc481c68' 
  AND token = 'BQfSlH028Eclk3l/u2y7XvvonWzBOIVvtHudKZv0l0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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