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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed5d0c750783db2f25ebf35d58ca1bf0c7c9139a2bf2a9666a4f8166d1c3c60' 
  AND token = 'tL2M698MqMfS2j1ihHgykb8ATSDelGH3wWfB8nUiJMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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