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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75285d98d48c591ea630f62dbd068ba50d5659bf416a571a67920adf5c552feb' 
  AND token = 'je6PRIkqUh+vdSrToR7EbC+PyIiFSBERRPkfEFIK4ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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