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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3188c5cac32a67289c90267a8dff9bf2fd8c91a609fce6c585dfab2d477fb4c5' 
  AND token = 'WYBXYfGgbPLhq5Gdlt4fZ20c3GiqwA6Pk8I4TbjfNt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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