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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee1ff7d87704e55a8c6416b3f59240bd5979c44338fbf4c555c73d0b92211b8' 
  AND token = 'CWAr5tmFPhY9qyRfoOKsjU0ersOy8yO6O2bxoRSDHJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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