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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8aaf2e7d415f2302055e65740e1ca2d9827dc2b4b1d41578d9d50c00534ac6b' 
  AND token = 'D1vTpUpX6cOO1X18D4y2agDGTjloCdCVloa2zv1ql1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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