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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2653daff93b11a24475b8bfc9290fb3e8a7771e9464c8cbf678e4e9c5f2e52cf' 
  AND token = 'T+ol2oS9bKLszGVc/gCN41ARDnZTOOoIb0m2i2erdbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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