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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82189f64f201a421dac37b96bedb1225871fa223417120132bc615e3d293b3d7' 
  AND token = 'if1Q8C9kNQUX6/o1nxNySQey6J23F86Mzb0u1m4MTk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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