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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba10b85612553c80bf9dfbd473943aa2723e0f831905f11c6054be6b9a6f4e52' 
  AND token = 'oMg9Vy7gWT7dsvdoVResnZp7N9DXsdwzhkf0YVUp6bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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