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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d52a0985288b972bcca2f5dc3e681536b5e8a498b2acd4d53b4a7304aeca53' 
  AND token = '/KblE35FBxIv4uk0j4yNjGcDcpPRcIv4ITXll7eVv1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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