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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11d5650f076498ff9f5b0fd4a9220e8ad4a25aee6408f2f599b0e63f65717e8' 
  AND token = 'xV+xz5ju+/2fsoeoAjfV+pS/w5KezrrP5Mx7DBU932E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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