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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7019adab6be9823848cc404f72cd9aa5be2df1737f602b8d3684439e36eb5bd' 
  AND token = 'kqc/PQ4vfiT8Eu+AxngxzktJFHI2rvfW2g8Im5BETHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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