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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae3bbdf943c2de1f4ed4c8304ceb5304aae00c2d2b57fbdec620736c37ffaaf' 
  AND token = 'VEh+jA/HooqvvxATIJCil097ylCnrvhU2Fe7rZBcSV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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