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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c7f0a61477068e1a7956ee067eccd7a442cde5f61be778551180907ece7023c' 
  AND token = 'f6RoqEq0WOIWZtCGCZ69kITalx3Yeif3o+wiT85m72Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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