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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d63be18c6edaed00111c42ec36693b9ea390f3bd37497fa6b40d1b71b3dc8b' 
  AND token = '7PzN0L57lIq3wCirBL90srQKm+xLuY2byAyOvmvrvRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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