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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e91e09f010e11e96d13a7dde9667595617e98010162e61df57b48d5e5d520fc' 
  AND token = 'JBgF06yJE/P3bu/37xM8TIw/YuiszOMab39hSA67jNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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