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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cfc2cde1766f49f926dc4973a18842760bac2a4436ed6c8868d8acf6000438a' 
  AND token = 'p92zUX4Ud9c02Z/wlp5R7As4NNKtRhot+eqgEB4W8cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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