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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5dc8000e08eee8ef0009a3a8be011b31dd3fad5fb7064d4726a86a4eadb72d7' 
  AND token = 'aKOYr+rzjRgyASeXhH3Dab2o50dcXXknBI/zgpqpN+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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