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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3679de757fe80cf98132317eb591594e53417321aa7475c24a54bf8636b77eec' 
  AND token = 'E51Rj2HO/+KI8GhKepqa51hgG+4hy7zIDbl0K6mdlCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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