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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b12aedc5e9e5fbb91e961d4288bf4a32ae4e00f7a927d26ba76ee9b2c84e95c' 
  AND token = 'ptsZ2Wrl8mLMx3YOQp7EXldmpv5tUzHhWyOnMJ/9W6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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