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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bcd6094ab1d9ac15f3f3bac7a5b950cca9423214cf08d0a36662cadf5eb9497' 
  AND token = 'MUrLdB/vJaCG4CpI16d4CjU+lklrH8sNgmebJCIlZHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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