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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c74e216d63cf26a8887a9914f0eacb03d654ee12f0ad468c3b6a4112c36a30f7' 
  AND token = '7NBvQ2UjseMK/u22A9BB0Kx4V4TAtv5J7x0lVRTB77s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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