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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9148294120051c0a40aa7721558f9279d5e0c824b31c476432a897ffecd45377' 
  AND token = 'MZzb077PmddX3kmO6ZuDHN9fugXtGFFy/Y8D457jKHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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