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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1149eb2d8968c244f31cc40d2d8eae4c42cbd99717d3b930a0c3ea495ae985' 
  AND token = 'mOHXHd6jPkFSfZ7TW5tKELmS4wf0StcEx+FwZyepbcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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