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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828a8017b32f3c26a635f23752f138a48e3585501f284e9eff3d84672ae07ae4' 
  AND token = '5C/LtqihD2Afra9y5/Fkh+rEIUh9G+9L9iRJPjZPs0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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