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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c46dad320e5a4073c167ee4a5d0d0e3fec2c76a355b8fdfaf158c2f59c00ec5' 
  AND token = 'bK5IOZUn0YY3+W6jWmI5vfwBs2xbmme4eb1VS8rFasM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00118

JSON explain

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