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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8191710070dc6c7a2cf77cd0a0fc47494c3385f6fc89ddc2dab935d163c6eb' 
  AND token = '3aX3MKrRQonZ3oK7vTjE0/xwcWoYrVpWXjdjoaLvJ90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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