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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9aa51b8ff89ea6bcde4f1a25e20ae0ebc1a66b05dcb6f1d89c2780bc5d2ae99' 
  AND token = 'VccemDcUETJgr1Y+n/cdFpoiV03U8QvfdHaZvMDvj5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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