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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a3d763655ae2f0800d99df939795f0e3e9e370b0f544dc14bdc7626e40e7d4' 
  AND token = 'mxorncLGOxe0HbqHbgIAdKK33ua7anYcnTuz8Qb0PqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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