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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34fa92e06863584020edbdfb8248aef50151b2663276cd380a63ddda29be14d7' 
  AND token = 'WySvTsQmhVx8f03UoRuD/h4QaKOHbVH6TcG2KfqUQ08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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