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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4814812d5710bd0933e4278ef590bc0fc519b568e8585d508f121579bb98db89' 
  AND token = 'AUm5OEoqQOZ3B8o0oeBrl2ieKeZdOOc4kgHtk2B/K9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00143

JSON explain

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