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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '236b8795a8bec4d582e1bf7c9135c24f2ad24626100366d0723ebf7942e5248d' 
  AND token = 'oenwLOvie46P5EGvoaNzCUHH8l89T8TKF9TtESRaYs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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