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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee5d0972cbd3b6f5b8da1f2193e0320eb9b0979eb87ccbe1a3c3f8ef758f630' 
  AND token = 'OvSwJPIlCT8znNviMi8h0iK16eHcOuag/0A6DOl/qCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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