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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470510d56e79f7abee04612a01b4d5dd11e45ae3e9ecdd4cef2b7b2e85454891' 
  AND token = 'R2Fuj8kBLk+d7HrS8AK4X0UcUxA5/WIzzEC05xpISHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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