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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c71995a4481e1d2b09149289cc95240860fdc95c54364b1e5db3d31038a461a' 
  AND token = 'hOIXAVO9bhoqhcMvXuw8jbPzoePxt83FNPIIote9/Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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