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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac1ed6ee853a0ff9cc9619ba10f8add5c5f569ab29ef0759e51b824b60aebc7' 
  AND token = 'YC4DnIYHPv/czVQq8v5a7vFgCE8iXgsXGM+Fzqqv86I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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