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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a342a5926cbb74f5769fe208265cbcbd244c2f3be22483a1859ff0f3e76a9c9' 
  AND token = 'nOne2FKj7oXNZYDf2lTqt5PkKGYrCHw6nwxutbPbiLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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