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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab443297f6b23db9313ae412cfd5e830b115465b74bb033770a12f6ff962165f' 
  AND token = 'XTjchPeEE0WHZryhBn6nZj0DAUjx5gVZtk+JPK5gtCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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