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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ade866fa9b8ccd10ef897006744d388a2466139f84ca07f243d2686086549b' 
  AND token = 'gJO3D/u4qBLpPDu+X0+TNF54NBbExsu/dftyxu2HOoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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