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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a79cedbf8a1627015af5368cba4d1979bf12a29079071316c519027cea773c2' 
  AND token = 'V0505N8uxzxdYHGG9BKPlIhiu0odPqzi0ZBF3F95Kwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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