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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e88c7024a7e4f7e9fb73eeb5d08130d0759d5cea301b8a6bc78dbafa656fec3f' 
  AND token = 'togHlZ7amjHaBaCw6U6vyzIHtT3xJVPL59fpfACw37Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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