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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aadd2b91ea1b14410376c809a3f6af625094aa382335f40700e6aaf82bf12fc2' 
  AND token = '+I8VtCX3pFapRxf0vo9WRlzxGcT1PUVM+U12lcdaURE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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