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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bbc16c4604edc8ea1e13246c1d7d5254201c87af07b78b92f3ea12ef68e8633' 
  AND token = '+nlgsuEyqjOgD4O763DnMne6OEP6EgJfcsIrk53AUK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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