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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d705acf5f0b563eb0a168d13da736a2782f4390645b48500fdb3d3970e5106' 
  AND token = 'QCkho1YhkoXJYyuFPWHuEAT6LKcRKW+6bZR3sfTfIJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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