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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd50826de7e1a864df0f46a292664e8aac44bb59fc2e3b878d0b082d68f323156' 
  AND token = 'Us98OHAOoAKu4euHjCtMdgLHYEzxxzDzJrtLEp/n2+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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