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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1987dd1f2b09843f12569e638731da97666ebf22bd1968e8efeefa72b3688bf7' 
  AND token = 'L2qyJDJkgf9tbGe/q9GShiDIefbMQe5Nepv/kR+2sMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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